L6997STR datasheet(26/30 Pages) STMICROELECTRONICS

Part #	L6997STR

Description	STEP DOWN CONTROLLER FOR LOW VOLTAGE OPERATIONS

PDF	30 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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26 / 30 page

L6997S

26/30

The current required by the Memory and Termina-

tion supply, depends on the memory type and

size. The figures 28 and 29 show the efficiency for

the termination section of the application shown in

fig. 27.

Figure 28. Eff. vs. Output Current Source Mode

Figure 29. Eff. vs Output Current sink mode

Typical Operating Characteristics

Figure 30. Load transient response from 0A to 5A..

Figure 31. Normal functionality in SINK mode..

100

Output Current (A)

Vout = 0.9V

Vcc = 5V

Fsw = 200KHz

Vin = 12V

Vin=1.8V

100

456

Output current (A)

Vin=12V

Vin = 1.8V

Vin = 12V

Vout=0.9V

Vcc=5V

Fsw=200KHz

Ch1-> Inductor current

Ch2-> Phase Node

Ch3-> Output voltage

Ch1-> Inductor current

Ch2-> Phase Node

Ch3-> Output voltage

L6997STR Datasheet(PDF) 26 Page - STMicroelectronics